A DGPS integrity monitoring algorithm to detect the satellite clock failure

This paper deals with an integrity monitoring to prevent the maritime DGPS malfunction by an anomaly such as satellite clock failure. Firstly this paper carries out a study to analyze the pseudorange error on PRN23 and the impact on DGPS reference station at that time in order to reproduce the anomaly of GPS satellite clock. And this paper makes a close investigation into the process of maritime DGPS malfunction under the reproduced anomaly circumstances. It is shown that the cause of maritime DGPS malfunction is the impact on the pseudorange correction values of the healthy satellites by PRN23 anomaly raised in process of computing the pseudorange corrections. And a DGPS integrity monitoring algorithm is proposed in order to make up the maritime DGPS malfunction by an anomaly such as satellite clock failure. Finally, this paper shows the validity of the analysis results on the maritime DGPS malfunction and the performance of the proposed algorithm.